Synonyms|251Antonyms|39|Broader|2Narrower|0Related|383

81 entries under hard topic. ×

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consolidated(adjective, set, strong, firm)
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disciplinary(adjective, strong, tough, sturdy)
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ferric(adjective, strong, tough, sturdy)
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ferrous(adjective, strong, tough, sturdy)
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forbidding(adjective, strong, tough, sturdy)
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frowning(adjective, strong, tough, sturdy)
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hang-tough(adjective, strong, tough, sturdy)
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hard-and-fast(resolute, rigid, inflexible, strict)
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hard-bitten
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hard-handed(adjective, set, strong, compact)
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hard-shell(adjective, strong, tough, sturdy)
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hard as nails(expression, adjective, idiom, set, strong)
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indurated(adjective, set, strong, firm)
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mortified(adjective, strong, tough, sturdy)
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packed(adjective, set, strong, firm)
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rock hard(expression, adjective, strong, tough)
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rough(adjective, strong, tough, sturdy)
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serious(adjective, strong, tough, sturdy)
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steel(adjective, strong, tough, sturdy)
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tough inflexible(expression, strong, tough, sturdy)
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ChicagoSmart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, adamantine thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>.
MLASmart Define. "adamantine thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms>